Starting from $180K · Second floor, rear & laneway
Plan a second-floor, rear, or side addition with one Toronto design-build team. We assess your home and lot, coordinate design and permits, and manage construction through handover. You receive a fixed-price proposal for the approved scope and one dedicated project manager throughout.
WSIB CertifiedRecent addition work in Forest Hill, Rosedale, Lawrence Park and surrounding neighbourhoods — review structure, glazing, envelope, and finished-space details before planning your own scope.
Every Toronto property is different. These are the main factors we assess during feasibility and design — not a price list, but a clear picture of what shapes your project scope before we issue a fixed-price proposal.
Foundation condition, load paths, stair placement, and roof tie-ins determine engineering scope — especially on pre-war homes in Forest Hill and Rosedale where reinforcement may be required before a second floor can be supported.
Lot width, depth, access for equipment, soil conditions, and proximity to property lines affect excavation, underpinning, and how much livable space can be added within zoning limits.
Heritage Conservation Districts, ravine setbacks, tree protection bylaws, and side-yard limits can require Committee of Adjustment hearings or design adjustments that affect both timeline and build approach.
Interior finish level, mechanical upgrades, architectural detail, and permit path (standard, FASTRACK, or variance) all influence scope. We flag the full approval path early so design reflects what the city will approve.
For a directional estimate by addition type, use our Home Additions Cost Calculator. For detailed pricing research, see real 2026 second floor addition costs in Toronto. To compare completed addition scopes, review our home addition project gallery.
Maserat Developments helps homeowners in Forest Hill, Rosedale, Lawrence Park, Leaside, The Annex, and surrounding Midtown neighbourhoods add space without leaving the community they value. As a Toronto design-build firm, we guide you from first feasibility review through construction and handover.
Each project includes full permit handling in-house and a dedicated project manager from design through handover. Whether you are exploring a second floor, rear expansion, or laneway suite, this page outlines the main options and how we work.
Start with the space you need: bedrooms upstairs, a larger ground-floor kitchen and living area, or a separate dwelling. We compare the options against your existing house, outdoor space, access, and approval path before developing a design.
Building up keeps the existing footprint but requires structural and stair planning. A rear or side house extension adds ground-floor space and uses part of the lot. A garden or laneway suite is a separate dwelling, rather than an extension of the main house. The right choice depends on how you want to use the space.
A second floor addition builds upward on your existing footprint to create bedrooms, a home office, or a primary suite. Compare this option when keeping garden space matters. The feasibility review considers the existing foundation and structure, stair location, roof changes, and how the new floor connects to the rooms below.
Explore our second-floor additions in Toronto page for process, permits, and design-build scope. For budgeting, read our second floor addition cost guide.
A rear addition extends the back of the house for a larger kitchen, living area, or mudroom. Compare it when your priority is ground-floor space connected to the garden. Planning considers the remaining yard, daylight in existing rooms, excavation access, and how the old and new floor levels meet.
See rear and side addition options for how ground-floor expansions are planned on Toronto lots.
A side addition uses available space beside the house for a wider room, home office, or improved circulation. It depends on usable side-yard space; a narrow lot may leave little room to expand. We assess separation from neighbouring buildings, access, windows, and how the extension connects to the existing layout.
Learn more on our rear & side additions page.
A garden or laneway suite creates a detached dwelling for family or rental use rather than adding rooms inside the main home. Compare this option when independent living is the goal. Feasibility considers access, service connections, outdoor space, and the approvals for your specific property.
Read our laneway & garden suites page, the zoning bylaws guide, and our laneway & garden suite resource guide for feasibility, permits, and design-build scope.
A clear, four-step path from first meeting to handover. Your dedicated project manager coordinates each phase and keeps you updated throughout — backed by our on-time completion guarantee.
We visit your property to understand your goals, assess structural feasibility, and review zoning constraints. Our team then develops architectural drawings and material selections for your approval. Once the design is confirmed, you receive a fixed-price contract — no open-ended allowances.
Maserat handles permits in-house — building permit applications, Committee of Adjustment hearings when needed, heritage alteration permits, and TRCA review for ravine-adjacent properties. We do not start demolition until approvals are in place.
Licensed trades execute structural work, systems installation, and interior finishing. Your dedicated project manager provides regular progress updates, coordinates city inspections, and manages the site so disruption stays predictable.
We walk you through the completed space, confirm every detail meets our standards and your expectations, and provide documentation for warranties and maintenance. Our on-time completion guarantee applies through to final handover.
Most home additions in Toronto require a building permit before construction begins. Established neighbourhoods often carry additional requirements — heritage alteration permits in conservation districts, TRCA review near ravines, tree protection bylaws, and Committee of Adjustment hearings for minor variances on setbacks or height.
We manage the full approval path so you are not navigating City departments on your own. For permit types, review timelines, and what to expect at each stage, read our Toronto Building Permit Guide.
A free consultation on your property covers feasibility, the permit path, cost drivers, and what to expect before design begins.
Free consultation · No obligation · Response within 24 hours
Or call (416) 876-1052
A Toronto design-build firm with 50+ Toronto projects — we take on fewer projects than volume contractors so every addition receives direct attention from the same team.
Your contract price is set after design approval — not a range that grows during construction. You know the full scope before work begins.
One point of contact from consultation through handover — coordinating trades, inspections, and updates so you always know where the project stands.
WSIB Certified and fully insured. Decisions stay with the team you meet at consultation — not a rotating subcontractor network.
Homeowners choose Maserat for a documented process, neighbourhood experience, and an on-time completion guarantee on every build.
We've completed 50+ projects. Here's what clients say about working with us.
Thoughtfully designed home additions across Toronto's most established neighbourhoods — expanding your space without leaving the street you love.
View all service areas →Second-floor additions on established lots
View projectsRear & side additions on heritage properties
View projectsFamily home expansions & second-floor additions
View projectsSemi-detached additions & rear expansions
View projectsHeritage-compliant additions & rear expansions
View projectsTownhouse additions & vertical expansions
View projectsPeriod-sensitive additions on grand properties
View projectsEdwardian home additions & rear expansions
View projectsDetached home additions & upper-floor expansions
View projectsGround-floor & second-floor expansions
View projectsRavine-lot additions with TRCA coordination
View projectsInfill additions & vertical expansions
View projectsToronto home addition costs, ROI data, permit timelines, and design guidance. Everything you need before adding on.
Real return data by addition type. Neighbourhood-ceiling rule and the secondary-suite income angle.
Cost GuidePer-sqft pricing, the costs most homeowners forget, permit timelines, and build up vs build out.
Addition TypeWhen rear addition makes sense vs second-floor or moving. Zoning, design, and common mistakes.
Addition Type2026 costs, zoning rule changes, rental income potential, and permits for secondary suites.
PlanningWhat to look for, how to compare quotes, red flags to avoid, and why design-build makes sense.
Professional from start to finish. Our addition looks exactly as we hoped and came in on time and on budget.
Fixed pricing meant no surprises. The team was respectful of our home and kept the site tidy.
We needed more space without moving. Maserat delivered a beautiful second floor addition and made the process straightforward.
Our laneway suite was built on time and to code. Clear communication throughout.
The rear addition feels like it was always part of the house. Highly recommend.
From design to handover, Maserat made a complex addition feel manageable. Clear communication and fixed pricing gave us confidence throughout.
Common questions about planning, permits, timelines, and pricing for Toronto home additions.
Have more questions? Browse our complete FAQ centre →
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